Remove '!' operators

Author: v-wuzhai

test/Microsoft.NET.Build.Containers.IntegrationTests/EndToEndTests.cs

@@ -328,14 +328,14 @@ public async Task EndToEnd_NoAPI_ProjectType(string projectType, bool addPackage
 
             (string? packagePath, string? packageVersion) = ToolsetUtils.GetContainersPackagePath();
 
-            new DotnetCommand(_testOutput, "nuget", "add", "source", Path.GetDirectoryName(packagePath), "--name", "local-temp")
+            new DotnetCommand(_testOutput, "nuget", "add", "source", Path.GetDirectoryName(packagePath) ?? string.Empty, "--name", "local-temp")
                 .WithEnvironmentVariable("NUGET_PACKAGES", privateNuGetAssets.FullName)
                 .WithWorkingDirectory(newProjectDir.FullName)
                 .Execute()
                 .Should().Pass();
 
             // Add package to the project
-            new DotnetCommand(_testOutput, "add", "package", "Microsoft.NET.Build.Containers", "-f", ToolsetInfo.CurrentTargetFramework, "-v", packageVersion)
+            new DotnetCommand(_testOutput, "add", "package", "Microsoft.NET.Build.Containers", "-f", ToolsetInfo.CurrentTargetFramework, "-v", packageVersion ?? string.Empty)
                 .WithEnvironmentVariable("NUGET_PACKAGES", privateNuGetAssets.FullName)
                 .WithWorkingDirectory(newProjectDir.FullName)
                 .Execute()
@@ -499,14 +499,14 @@ public void EndToEnd_NoAPI_Console()
 
         (string? packagePath, string? packageVersion) = ToolsetUtils.GetContainersPackagePath();
 
-        new DotnetCommand(_testOutput, "nuget", "add", "source", Path.GetDirectoryName(packagePath), "--name", "local-temp")
+        new DotnetCommand(_testOutput, "nuget", "add", "source", Path.GetDirectoryName(packagePath) ?? string.Empty, "--name", "local-temp")
             .WithEnvironmentVariable("NUGET_PACKAGES", privateNuGetAssets.FullName)
             .WithWorkingDirectory(newProjectDir.FullName)
             .Execute()
             .Should().Pass();
 
         // Add package to the project
-        new DotnetCommand(_testOutput, "add", "package", "Microsoft.NET.Build.Containers", "-f", ToolsetInfo.CurrentTargetFramework, "-v", packageVersion)
+        new DotnetCommand(_testOutput, "add", "package", "Microsoft.NET.Build.Containers", "-f", ToolsetInfo.CurrentTargetFramework, "-v", packageVersion ?? string.Empty)
             .WithEnvironmentVariable("NUGET_PACKAGES", privateNuGetAssets.FullName)
             .WithWorkingDirectory(newProjectDir.FullName)
             .Execute()

test/Microsoft.NET.TestFramework/Commands/DotnetCommand.cs

@@ -5,9 +5,9 @@ namespace Microsoft.NET.TestFramework.Commands
 {
     public class DotnetCommand : TestCommand
     {
-        public DotnetCommand(ITestOutputHelper log, params string?[] args) : base(log)
+        public DotnetCommand(ITestOutputHelper log, params string[] args) : base(log)
         {
-            Arguments.AddRange(args!);
+            Arguments.AddRange(args);
         }
 
         protected override SdkCommandSpec CreateCommand(IEnumerable<string> args)

test/Microsoft.NET.TestFramework/OutputPathCalculator.cs

@@ -236,7 +236,7 @@ public string GetPublishDirectory(string? targetFramework = null, string configu
 
                 if (IncludeProjectNameInArtifactsPaths)
                 {
-                    return Path.Combine(ArtifactsPath ?? string.Empty, "publish", Path.GetFileNameWithoutExtension(ProjectPath)!, pivot);
+                    return Path.Combine(ArtifactsPath ?? string.Empty, "publish", Path.GetFileNameWithoutExtension(ProjectPath) ?? string.Empty, pivot);
                 }
                 else
                 {

test/Microsoft.NET.TestFramework/TestAsset.cs

@@ -133,7 +133,7 @@ public TestAsset ReplacePackageVersionVariable(string targetName, string targetV
             {
                 if (project.Root is not null)
                 {
-                    var ns = project.Root!.Name.Namespace;
+                    var ns = project.Root.Name.Namespace;
                     foreach (var PropertyName in PropertyNames)
                     {
                         var packageReferencesToUpdate =
@@ -234,7 +234,7 @@ public TestAsset WithProjectChanges(Action<string, XDocument> xmlAction)
             {
                 FindProjectFiles();
             }
-            foreach (var projectFile in _projectFiles!)
+            foreach (var projectFile in _projectFiles ?? new())
             {
                 var project = XDocument.Load(projectFile);
 

test/Microsoft.NET.TestFramework/TestAssetsManager.cs

@@ -110,7 +110,7 @@ public TestAsset CreateTestProjects(
 
             foreach (var testProject in testProjects)
             {
-                new DotnetCommand(Log, "sln", "add", testProject.Name)
+                new DotnetCommand(Log, "sln", "add", testProject.Name?? string.Empty)
                     .WithWorkingDirectory(testDestinationDirectory)
                     .Execute()
                     .Should()